Tubular cord.



J. D. TEW. TUBULAR'CORD.

APPLICATION FILED N'0V.1l, l9l3.

Patented June 22, 1915.

2 SHEETSdSHEET l'.

:niggaz/y" Mew/df.' Lfd/ness@ [gw Patented June 22, 191.

2 SHEETS*SHEET 2.

I. D. TEW.

TUBULAR CORD.

APPLICATION FILED NOV. II, I9I3.

Wfhesses/ K To all whom, 'it muy concern UNHSED STATES PATENT oniricar reuse D..- Taw. DE ewa 0m0- @am @se Be it known. that I, J AMES D. TEW, 'a citizen of the United States., residing at Akron.

' in the county of Summit and State of Ohio,

have invented certain new and useful Improvelvnents in 4'I luhular Cord, 0f which the following is a'lspecification. A

My invention` relates in general toune,- Inatic tire casings and' more particularly t9 an imprved Cord for use in 'tanning the layers of strain-resisting. fabric in the tive It is well-known' that when asoli'd cord of round cross section-is wound on a form baving theshape of a pneumatic tire, there are necessarily open spaces between the adjacent lconvohl. tions of the cordon-the. outer Periphery, such spaces being greatest at' the tread, or outside diameter, and gradually decreasing as they reach the inner diameter. When the ordinary 4solid round cord is used it is impractica-ble'to fill these open spaces between. the adjacent convolutions of the cord by the application of pressure, inasmuch as the cord. cannot be flattened sufliciently to cause .the adjacent -convolutions to contact with each other andv thereby close such spaces. Consequently. the layers of strainresisting fabric formed by the convolutions of cord. are not uniform around thetread, but comprise spaced cords, A Y' The primary object of my invention is to provide a cord for use in making the layers of strain-resisting fabric in` tire casings, which, when` subjected to a moderate degree of pressure, will flatten lso as to almost fill the gradually decreasing spaces between adjacent convolutions ofthe cord, thereby prol ducing a strain-resisting fabric composed of cords separated only by a thin insulation of rubber. I accomplish this object by employing cords with Ya hollow center so thatl by applying a moderate degree of pressure to them after they are wound their cross section near the outer diameter, or tread of the tire casing, willbe appreciably'elongated, thereby 'nearly lling thelarger open spaces adjacent .the tread, and filling the gradually decreasing open spaces extending from the tread to-.the side edges of the casing.

The process of making tire casings by laying the hollow cords of thisinvention on a former and thereafter attening them by pressure is described and claimed in my copending application No. 856,621. iledAir specificata@ of Leitart- Patentf Patented June 22, 1915. Application sied Hqvember n, una. serial no. acosa?.

gust 13', 1914. The tire casing itself, built with the hollow cords of this invention, vis 'described and claimed in my copending ap- PlCationNo, 833,248, filed .April 20, 1914.

The present application'relates to the cord 5 itselt, which has thel capacity of normally f' holdlngits shape but -of being flattened by pressure to produce the desired result.

MY invention'will be moreufully disclosed "hereinafter with 'reference to the accompanylng drawings, in whichv the same isllustrated as embodied in a convenient and lpractical form, and in Whichf-v View O my improved cord; Fig.- 2- a side eleuational View of a short .length of the cord; Fig. 3 an 4enlarged cross-Section of adjacent onvolutions of the cord before bein sub- Jectedt0 preSsurerFig-.A a view simar to Fig. 3 showing adjacent convolutons after being subjected to pressure, such' section be-i section of a tirecasing comprising' superposed layers of convolutions of `my improved cord.

The particular cord illustrated, i .the

drawings is formed of siX strands 11, twist- -Each strand 11 is formed inthe usual manner of a'plurality of smaller strands. The' Figure 1 is an enlarged cross sectional strands 11 are rubberized Orctherwise treated with an adhesive coat permeating them more or less and thus rendering' them ad- In this waythe tubular cord will maintain its shape unless subjected to a moderate dcgree of transverse pressure'. y

A suitable machine for making my tubular cordl is described and claimed in my ap` formed between adjacent convolutions eX-' hesive and givingthem a'degree of-stil'ness. i

90 ed side by side around a. hollow center 12.

tending from the inner periphery of the s mandrel around the sides thereofl to the tions thereof are separated only by a thin insulation of rubber. The cross ,section 11nparted to the cord by suchl pressure is indicated in Figs. 6 and 7 A by 'reference-'to which it will be seen'that the` portions of the convolutions at the tread are flattened into practically rectangular form,as indicated in Fig. 4, while the crow section of the cords at the sides of the tire are more nearly square, as the spaces to be filled at the'sides of the tire-are narrower than the spaces at the tread of the tire and hencev the cord is least flattened at the sides and gradually increased in flatness toward the tread.

After the layer of cord has been`subjected to pressure, a thin coating of rubber 16 is applied thereto which tends to fill vany slight openings which may remain between the adjacent convolutions of the cord, thereby insulating lthe' convolutions ofthe cordv frm each other.

A second layer 14 is formed upon the first Alayer. The thin coatingof rubber 16 serves as an insulating medium between the adjacentrlayers of "cord, as well as between the adjacent-convolutions .of cord in each layer.

In Fig. -7 I have shown my improved cord embodied in a tire casing which may be made by the process disclosed in my copending application Serial No. 856,621, referred-to, in which the suprposed layers of cord are Split around the inner periphery of the form and their severed edges folded back into grooves 19 formed in` beads 20, and in which a filler 21 is applied along each inner edge of the casing so as to impart to the bead a sharp toe.

22 designates a strip of frictioned fabric applied to each side of the tire casingadjacent the inner edge thereof and extending around the bead 20 and overlapping the ad jacent outwardlyl foldingedge of the cord layers 13 and 14.

.flattened under pressure.

`23 designates strips of frictioned fabric formed around the iller 21 at each vinner edge of thefside of the casing and `overlap` ping the adjacent edge of the strip 22. l While I have illustrated my improved cord as embodied inV a tire 'casing of the construction produced by` the process dis'- closed in my abo've identified cao-pending application, yet it willbe understoodv that my improved hollow cordl is not limited in its use to tire casings of such construction vbut isapplicable to other specificforms oftire casings.

From the foregoing .description itfwillfbe l observed that I'haye invented an improved hollow oord for-use in constructing; tire casY ings,7 lwhich owing to its compressibility permits the formation 'oit layers of convolutions thereof in which the spaces between adjacent convolution's are practically closed by the flattening of the cord to an extent corresponding to the gradually decreasing sizes of the-spaces from the .tread toward the sides of the tire casing.

I claim:

1f. 'A cord for tire casings consisting of al plurality of. strands Wound side by side around a hollowV center and treated with an adhesive material to impart to the cord a definite normal shape'but capable of being 2. A hollow twisted rubber treated textile cord.`

3. A cord made ofv a number of rubberimpregnated vStrands twisted together about a central bore.

43A hollow cord made of strandsiimpregu my name.

JAMES D. TE-N. Witnesses:

J. V. BLAKE,

L. -A. SMITH. 

